Mercury gauge test procedures are located in which NFPA section?

The procedures for conducting a mercury gauge test are detailed specifically in NFPA 25, which is the Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems. Within this standard, section A.9.3.1 provides the most relevant guidance regarding gauge testing procedures, which is crucial for ensuring the accuracy and reliability of pressure measurements in water-based systems.

Mercury gauges are commonly used to measure pressure in various components of fire protection systems, and proper testing protocols are essential to maintain system integrity. NFPA 25 aims to provide comprehensive guidelines to ensure that these systems function as intended, which includes the appropriate calibration and testing of pressure gauges.

The other options correspond to different NFPA standards that address other areas relevant to fire protection—such as the design and installation of sprinkler systems (NFPA 13) and fire alarm systems (NFPA 72)—but do not focus specifically on the testing of mercury gauges. Thus, the correct choice for the mercury gauge test procedures is found in NFPA 25 A.9.3.1.